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Q: Why do you use mechanical calculators?

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scientific calculators have scientific calculations such as scientific notation, but mechanical ones dont.

No, the very first mechanical calculators could only add and subtract. The first mechanical calculators were invented in 1623 by Wilhelm Schickard, followed by the Pascaline, invented in 1645 by Blaise Pascal. However, calculators that could multiply and divide were in use by the 19th century.

No, and no.

No because now we have the new "Thing" Calculators! look it up in Wikipedia also!

most calculators are powered by solar energy but some are powered by batteries

no but solar panels are in solar calculators

simple calculators

Yes they do use calculators they have very large sums to work out sometimes! Yes they do use calculators they have very large sums to work out sometimes!

“Are there any online retirement or IRA calculators that are free for use?” are there any online retirement or IRA calculators that are free for use?

You can find loan calculators online that do all of the work for you. Bankrate.com has several different financial calculators to use. You simply plug in your numbers and it does the rest.

The Abacus

yes

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